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Plasmodium falciparum Gametocyte Culture and Mosquito Infection Through Artificial Membrane Feeding
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Parasite infectivity and immunity to Plasmodium falciparum gametocytes in Gambian children

C J Drakeley1, W Eling, K Teelen

  • 1Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel St., London WC1E 7HT, UK. chris.drakeley@lshtm.ac.uk

Parasite Immunology
|September 16, 2004
PubMed

Insights

Immunity against malaria

Area of Science:

  • Immunology
  • Infectious Diseases
  • Vaccinology

Background:

  • Natural Plasmodium falciparum infections can induce immunity to sexual stages.
  • Understanding this immunity is crucial for developing transmission-blocking vaccines (TBVs).
  • Gametocyte carriers in endemic areas are key reservoirs for malaria transmission.

Purpose of the Study:

  • To assess functional transmission-blocking immunity in Gambian children.
  • To identify serological correlates of this immunity.
  • To evaluate antibody responses against key Plasmodium falciparum sexual stage antigens.

Main Methods:

  • Standard membrane-feeding assays (SMFA) and direct membrane-feeding assays (DMFA) were used.
  • Serological assays measured IgG1 responses to whole parasites, live gametes, Pfs230, and Pfs48/45.
  • Correlation analyses were performed between serological data and transmission-blocking activity.

Main Results:

  • 14/55 sera showed transmission-blocking activity in SMFA, correlated with IgG1 to Pfs48/45.
  • Direct membrane-feeding assays with autologous isolates showed activity in 4/29 sera.
  • No correlation was found between SMFA and DMFA results or between DMFA and serological assays.

Conclusions:

  • Functional transmission-blocking immunity exists in young Gambian children.
  • Antibodies to Pfs48/45 are associated with transmission-blocking activity in laboratory assays.
  • Discrepancies between assays suggest antigen variation or alternative immunity mechanisms, impacting TBV design.

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